In present work we report the analysis of thin films and targets from new stilbazolium dye E-4-(2-(4- hydroxynaphthalen-1-yl)vinyl)-1-octylquinolinium iodide (D1) deposited by Pulsed Laser Deposition (PLD) technique using high power UV TEA N2 laser. The thin films are deposited onto substrates – KBr, 316L SS alloy, optical glass and aluminum foil. The films were characterized by FTIR spectroscopy, bright field microscopy, fluorescence microscopy and atomic force microscopy (AFM) analysis. FTIR spectroscopic analysis of thin films and target material shows small differences between deposited films and native substance. The films are found to be homogeneous by AFM results and without any cracks and droplets on the surfaces. The present study demonstrates the ability of PLD technique to provide thin films from new stilbazolium dyes with good quality when they are applied as non-linear optical (NLO) organic materials on different type of substrates.
Drug-eluting medical implants are active implants whose function is to create healing effects. The current requirements for active medical coatings for Drug-eluting medical implants are to be biocompatible, biodegradable, polymer free, mechanically stable and enable a controlled release of one or more drugs and defined degradation. This brings hybrid nanocomposite coatings into focus especially in the field of cardiovascular implants. We studied the properties of Metal (Mg alloy)-Paclitaxel coatings obtained by novel Laser Adaptive Ablation Deposition Technique (LAAD) onto cardiovascular stents from 316 LVM stainless steel material. The morphology and topology of coatings were studied by Bright field / Fluorescence optical microscope and Scanning Electron Microscope (SEM). Comparative measurements were made of the morphology and topology of hybrid, polymer free nanocomposite coatings deposited by LAAD and polymerdrug coatings deposited by classical spray technique. The coatings obtained by LAAD are homogeneous without damages and cracks. Metal nanoparticles with sizes from 40 nm to 230 nm were obtained in drug matrixes. Energy Dispersive X-ray Spectroscopy (EDX) was used for identification of metal nanoparticles presence in hybrid nanocomposites coatings. The new technology opens up possibilities to obtain new hybrid nanocomposite coatings with applications in medicine, pharmacy and biochemistry.
A novel approach for one-step synthesis of hybrid inorganic-organic nanocomposite coatings by new modification of Pulsed Laser Deposition technology called Laser Adaptive Ablation Deposition (LAAD) is presented. Hybrid nanocomposite coatings including Mg- Rapamycin and Mg- Desoximetasone were produced by UV TEA N2 laser under low vacuum (0.1 Pa) and room temperature onto substrates from SS 316L, KCl and NaCl. The laser fluence for Mg alloy was 1, 8 J/cm2 and for Desoximetasone 0,176 J/cm2 and for Rapamycin 0,118 J/cm2 were respectively. The threedimensional two-segmented single target was used to adapt the interaction of focused laser beam with inorganic and organic material. Magnesium alloy nanoparticles with sizes from 50 nm to 250 nm were obtained in organic matrices. The morphology of nanocomposites films were studied by Bright field / Fluorescence optical microscope and Scanning Electron Microscope (SEM). Fourier Transform Infrared (FTIR) spectroscopy measurements were applied in order to study the functional properties of organic component before and after the LAAD process. Energy Dispersive X-ray Spectroscopy (EDX) was used for identification of Mg alloy presence in hybrid nanocomposites coatings. The precise control of process parameters and particularly of the laser fluence adjustment enables transfer on materials with different physical chemical properties and one-step synthesis of complex inorganic- organic nanocomposites coatings.
The usage of laser treatments for production of semiconductor elements becomes necessary in order of it is great advantages. The traditional methods for preparation of photosensitive layers from A2B6 compounds are vacuum evaporation, cathode or magnetron sputtering with additional thermal treatment and usage same techniques for contact areas formation of In, Ga, Al, Cd, CdO. The creation of Om- power points for solar elements, using CdS an n-layer, continues to be a problem because of the necessity of transparency and linear characteristics. In this paper is offered a method for preparation of solar cells deposited by vacuum evaporated on cital substrate with additional laser treatment by CW CO2 laser and in situ formation of Om- power points from CdO over a layer of CdS using UV TEA N2 laser. The electronic and compositional properties of solar cells were analyzed by XRD, XPS, and SEM. Using vacuum evaporation of CdS on cital substrate and laser treatments of layers in powder of CdS, CdCl2 and CuCl, the photosensitivity of CdS layers has been improved by 8 orders of magnitude, which makes them suitable for solar cells and photoresistors with planar Om contact areas from CdO with very high transparency - about 80% while it is about 1% for the metal power points.
A sliding-discharge directly-excited pulsed atomic fluorine laser was realized for the first time and investigated experimentally. The atomic fluorine was produced by dissociation of F2 in a He:F2 mixture by a fast-pulsed electrical discharge. The optimum active mixture was found to be 1.6% F2 and 98.4% He, at a total pressure of 90 mbar. A doubling electrical circuit was used for sliding discharge excitation. The laser performance characteristics (the voltage and laser pulses, output energy and gas mixtures) were studied. The laser spectrum consisted of three lines at 703.7 nm (3p2P03/2 yields 3s2P03/2) 712.8 nm (3p2P01/2 yields 3s2P1/2) and 731.1 nm (3p2S01/2 yields 3s2P1/2). The output power of the laser was higher than 1 kW and the pulse duration (at FWHM) measured was about 30 ns.
The growth and characterization of YBaCuO thin films and related buffer layers (BaTiO3, ZrO2, BaTiO3, LiNbO3) grown by laser ablation on Si and GaAs substrates, are described. Both buffers and YBuCuO layers have been deposited using XeCl excimer laser (308 nm). The morphology and structure of the films have been determined using XRD and SEM analyses. A good quality textured YBaCuO film could be grown on single crystal as well as polycrystalline buffer layer deposited on Si and GaAs. The key to the successful film deposition is the low processing temperatures involved, which minimized the interface reactions as observed by EDAX spectroscopy, as well as direct cw carbon-dioxide laser irradiation of growing film.
Comparative study of laser patterning of YBaCuO thin films has been accomplished using XeCl, N2, Cu, CO2, and Nd:YAG lasers. Various tracks of different dimensions and shapes have been generated using a computer-controlled X-Y stage. A complete removal of the film material has been achieved. Issues relating to the limit of resolution, annealing of films, and degradation of superconducting properties are discussed for the different lasers used. The cw carbon-dioxide laser has been used for irradiation of the films thus creating 'ex situ' and 'in situ' annealed regions with different film orientation and morphology. The films have been characterized using EDAX, SEM, and RBS.
Superconducting Y1Ba2Cu3O7 thin films were prepared by in-situ oxygen plasma-assisted XeCl excimer laser deposition. A multistep superfast CO2 laser annealing was investigated as a method of modification of the Y1Ba2Cu3O7 thin films on Si. It was revealed that cw CO2 laser heating of substrate surface may be also a method for reduction of particulate density. The buffer layers such as Ba(Sr)TiO3 and YSZ(111) were successfully experimented for preparation of good superconducting thin films. It is shown that N2 laser ablation may be a proper technique for patterning Y1Ba2Cu3O7 thin films. The films were characterized by EDAX, SEM, XRD and Raman spectroscopy.
Superconducting Y1Ba2Cu3O7 thin films were prepared by in-situ oxygen plasma-assisted laser deposition. It was revealed that cw CO2 laser heating of substrate surface may be a method for reduction of particulate density. The buffer layers such as Ba(Sr)TiO3 and YSZ(111) were successfully experimented for preparation of good superconducting thin films. A multistep superfast CO2 laser annealing was investigated as a method of modification of the Y1Ba2Co3O7 thin films on Si. It is shown that N2 laser ablation may be a proper technique for patterning Y1Ba2Cu3O7 thin films. The films were characterized by EDAX, SEM, XRD and Raman spectroscopy.
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